H+D/sub 2/ reaction dynamics. Determination of the product state distributions at a collision energy of 1. 3 eV

Journal Article · Tue May 01 04:00:00 EDT 1984 · J. Chem. Phys.; (United States)

OSTI ID:6858473

Marinero, E E; Rettner, C T; Zare, R N

Two-photon resonance, three-photon ionization has been used to determine the HD product internal state distribution formed by the reaction of fast H atoms with thermal D/sub 2/ molecules. A mixture of HI and D/sub 2/ is irradiated by a 266 nm laser pulse to dissociate the former, giving a center-of-mass collision energy of about 1.30 +- 0.04 eV for H+D/sub 2/. After a sufficiently short delay to ensure essentially collision-free conditions, a second laser is fired which causes multiphoton ionization of individual HD quantum states as well as D atoms, depending upon the choice of wavelength. Reaction occurs in a well-defined effusive flow which emerges from a glass orifice placed between the acceleration plates of a differentially pumped time-of-flight mass spectrometer. Ion signals are referenced to those obtained from HD or D produced in an auxiliary microwave discharge. Relative formation rates are reported for HD(v = 1, J = 0--6) and HD(v = 2, J = 0--6). Nascent D atoms are also observed and an upper limit is placed on the production of HD(v = 3). Rotational surprisal plots are found to be linear for the HD product state distribution yielding a slope of theta/sub R/ = 5.1 for HD(v = 1) and theta/sub R/ = 4.7 for HD(v = 2). These are extrapolated to provide full distributions for HD(v = 0--2, J = 0--6). The present product state distributions are compared with the recent experimental data of Gerrity and Valentini as well as with the quasiclassical trajectory calculations of Blais and Truhlar.

• Research Organization: Department of Chemistry, Stanford University, Stanford, California 94305
• OSTI ID: 6858473
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 80:9; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CHEMICAL REACTION KINETICS
COLLISIONS
DEUTERIUM
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
EV RANGE
EV RANGE 01-10
HYDROGEN
HYDROGEN ISOTOPES
IONIZATION
ISOTOPES
KINETICS
LASER RADIATION
LIGHT NUCLEI
MOLECULE COLLISIONS
MULTI-PHOTON PROCESSES
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PHOTOIONIZATION
RADIATIONS
REACTION KINETICS
SPECTRA
STABLE ISOTOPES